Buckle



FIG. 1 is a perspective view of the buckle showing the new design;

FIG. 2 is a side view thereof;

FIG. 3 is an opposite side view thereof;

FIG. 4 is an end view thereof;

FIG. 5 is an opposite end view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of an opening is included for the purpose of illustrating environmental matter and forms no part of the claimed design. 

The ornamental design for a buckle, as shown and described. 